# What is a pitch in a heat exchanger?

## What is a pitch in a heat exchanger?

The distance between the centers of the tube hole is called the tube pitch; normally the tube pitch is 1.25 times the outside diameter of the tubes. Other tube pitches are frequently used to reduce the shell side pressure drop and to control the velocity of the shell side fluid as it flows across the tube bundle.

## How is tube pitch calculated?

TEMA standards recommends a minimum tube pitch of 1.25 * Tube outer diameter for triangular pitch. For example, if we have a tube outer diameter of 12.7 mm (0.5 inch) then the recommended tube pitch for triangular pitch arrangement is: 1.25 * 12.7 mm = 16 mm (0.6 inch).

Which pitch is better for heat exchanger?

Triangular pitch
Triangular pitch (30o layout) is better for heat transfer and surface area per unit length (greatest tube density.) Square pitch (45 & 90 layouts) is needed for mechanical cleaning.

What is tube pitch and tube count?

The distance between the centres of the tube hole is called the tube pitch; it is typically taken as 1.25 times the outside diameter of the tubes.

### What are shell and tube heat exchangers used for?

Shell and tube heat exchangers are widely used in applications, which require cooling, or heating large volume of process fluids or gases. There are a number of different types of shell and tube heat exchanger designs to meet several process needs in virtually every industry.

### What is meant by transverse pitch?

The lateral distance between the center lines of each strand of a multiple-strand chain, or between the tooth profiles on a sprocket for a multiple-strand roller chain.

What is square pitch?

The most common design is that which is referred to as “square pitch”. The square pitch propeller has a pitch ratio of 1:1 which means for each rotation fluid is moved forward by an amount equal to its diameter.

How many tubes are in a tube and shell heat exchanger?

The number of tube-side passes is usually one, two, four, or six, but may be as high as 16. Multiple passes on the shell side are achieved by partitioning the shell with a longitudinal baffle (type F-shell) or by connecting two or more single-pass shells together.

#### How does a tube heat exchanger work?

A shell and tube exchanger consists of a number of tubes mounted inside a cylindrical shell. Two fluids can exchange heat, one fluid flows over the outside of the tubes while the second fluid flows through the tubes. The fluids can be single or two phase and can flow in a parallel or a cross/counter flow arrangement.

How many tubes does a heat exchanger have?

In Power plant 500-1000 MW or more turbine hot well surface condenser are available more than 10,000 Number of tubes. waste heat boiler in power plant gas turbine are shell & tube type heat exchanger are also larger size and having 5000-12000 number of tubes.